How do you escape colon (:) in Properties file?

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Put the properties into the Properties object and save it using a store(...) method. The method will perform any escaping required. The Java documentation says:

“… For the key, all space characters are written with a preceding \ character. For the element, leading space characters, but not embedded or trailing space characters, are written with a preceding \ character. The key and element characters #, !, =, and : are written with a preceding backslash to ensure that they are properly loaded.”

You only need to manually escape characters if you are creating / writing the file by hand.

Conversely, if you want the file to contain unescaped colon characters, you are out of luck. Such a file is malformed and probably won’t load properly using the Properties.load(...) methods. If you go down this route, you’ll need to implement your own custom load and/or store methods.

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